JarArchive.java

package org.objectweb.jonas_lib.genbase.archive;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.List;
import java.util.Vector;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

import org.objectweb.jonas_lib.genbase.GenBaseException;


public class JarArchive extends AbsArchive {

    private JarFile jar;

    public JarArchive(File jar) throws GenBaseException {
        super(jar);

        try {
            this.jar = new JarFile(jar);
            setManifest(this.jar.getManifest());
        } catch (IOException ioe) {
            String err = getI18n().getMessage("JarArchive.constr.jar", jar);
            throw new GenBaseException(err, ioe);
        }
    }

    public InputStream getInputStream(String filename) throws IOException {
        // try get the file from the map
        File file = (File) getFiles().get(filename);

        if (file == null) {
            // filename not found in added files
            // try jar search
            ZipEntry ze = jar.getEntry(filename);

            // Entry found ?
            if (ze == null) {
                return null;
            } else {
                return jar.getInputStream(ze);
            }
        } else {
            // file exists (in added files)
            return new FileInputStream(file);
        }
    }

    public List getContainedFiles() {
        List list = new Vector(getFiles().keySet());

        // add files of the original archive
        for (Enumeration e = jar.entries(); e.hasMoreElements();) {
            ZipEntry ze = (ZipEntry) e.nextElement();
            list.add(ze.getName());
        }

        return list;
    }

    public boolean isPacked() {
        return true;
    }
}

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